Fuel Flashcards
Min fuel
265 lbs
Engine in suction mode
10 hrs
Total usable fuel
384 Total
192 per side
131 wings and center
61 nacelle
Output pressure of electrical fuel pump (boost) and engine driven fuel pump (high)
30 psi
800 psi
The crossfeed valve opens in auto when the pressure switch senses a drop below _______ psi
10 psi
What type of pump is the boost pump
The boost pumps are submerged, rotary, vane-type electrical impeller pumps.
How do the center tanks receive fuel
Gravity feed from the wing tanks
Transfer pumps come on in auto when the nacelle tank drops how many gallons?
10 gallons
How are transfer pumps controlled?
By a float switch on the nacelle tank fuel quantity transmitter.
The transfer pumps will turn off automatically in what conditions?
If the system doesn’t sense pressure after 30 seconds.
When wing tanks are empty.
Pump failure
When the transfer pump is selected in override, what happens when the nacelle tank is full?
When the tank is full, excess fuel will return to the center tank through a vent line.
Where is the transfer pump located?
Center wing tank
Where is the boost pump located?
Nacelle tank
During normal operation, NO FUEL XFR means?
Fuel in the wing tank is exhausted and the transfer pump should be turned off.
If the transfer pump fails to operate during flight what happens to the fuel?
When the nacelle tank drops below 150 pounds (22gal) the gravity port opens and allows fuel from the wing tanks to enter. 28 gallons will be unusable in the center tank.
